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Voltage Pentode - Sharp Cutoff (single) ·Pentode

6676

Sharp-cutoff pentode designed for mobile-communications RF and IF amplifier service. Its fixed-gain high-frequency characteristics suit professional communications equipment rather than automatic-gain-controlled remote-cutoff stages.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
-
Socket code
B7G
Base pins
7
Nominal heater
6.3 V / 300 mA

Description

Sharp-cutoff pentode for mobile-communications RF and IF amplifier service.

Socket description

Miniature 7-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
-
Socket code
B7G
Base pins
7
Nominal heater voltage
6.3 V
Nominal heater current
300 mA
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

Terminal pinout

Electrical assignments shared by every tube using this base designation.

No verified pinout is recorded for this base designation.

Section ratings

1 physical section, each with unique specifications.

Section 1

Pentode

X-ray radiationInterelectrode capacitances
Plate resistance
280000 Ω
Transconductance
0.008 S
Max plate voltage
300 V
Max screen voltage
150 V
Max plate dissipation
2.3 W
Max screen dissipation
0.75 W
Max cathode current
30 mA

Alias/co-designation of 6CB6A;

Source-dependent data

Operating conditions by source

Each block preserves the test conditions and published values from one reference. Values from different sources are intentionally kept separate.

Data set 01

1971 RCA HB3 Binder 3 of 7

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • Heater voltage

    6.3 V

    Nominal

  • Heater current

    300 mA

    Nominal

  • Maximum plate voltage

    330 V

    Promoted published value

  • Maximum screen voltage

    330 V

    Promoted published value

  • Maximum plate dissipation

    2.3 W

    Promoted published value

  • Voltage (AC or DC)

    6.3 V

    Heater Characteristics and Ratings fAhsolute-Maximum Valuesl:

  • Current at heater volts =

    300 V

    Heater Characteristics and Ratings fAhsolute-Maximum Valuesl:

  • respect to cathode

    200 V

    Heater Characteristics and Ratings fAhsolute-Maximum Valuesl:

  • Grid No.1 to plate

    0.015 mA

    Direct Interelectrode Capacitances:

  • Plate Supply Voltage

    125 V

    Characteristics, Class AI pmol if ier:

  • Grid-No.2 Supply Voltage

    125 V

    Characteristics, Class AI pmol if ier:

  • Grid-No.1 Voltage

    -3 V

    Characteristics, Class AI pmol if ier:

  • Cathode Resistor

    56 ohm

    Characteristics, Class AI pmol if ier:

  • Plate Resistance (Approx )

    0.28 megohm

    Characteristics, Class AI pmol if ier:

  • Transconductance

    8000 uS

    Characteristics, Class AI pmol if ier:

  • Plate Current

    13 mA

    Characteristics, Class AI pmol if ier:

  • Grid-No.2 Current - •3.7 ma

    3.7 mA

    Characteristics, Class AI pmol if ier:

  • plate µa =

    -6.5 V

    Characteristics, Class AI pmol if ier:

  • PLATE VOLTAGE

    330 V

    Maximum Ratings, Absolute-Maximum Values:

  • GRID-No.2 (SCREEN-GRID) SUPPLY VOLTAGE.

    330 V

    Maximum Ratings, Absolute-Maximum Values:

  • GRIC-No.2 VOLTAGE See Grid-No.a Input Rating Chart

    2 V

    Maximum Ratings, Absolute-Maximum Values:

  • GRID-No.1 (CONTROL~RID) VOLTAGE

    1 V

    Maximum Ratings, Absolute-Maximum Values:

  • For grid-No.2 voltages

    2 V

    Maximum Ratings, Absolute-Maximum Values:

  • For grid-No.2 voltages be

    2 V

    Maximum Ratings, Absolute-Maximum Values:

  • tween

    2 V

    Maximum Ratings, Absolute-Maximum Values:

  • PLATE DISSIPATION

    2.3 W

    Maximum Ratings, Absolute-Maximum Values:

  • to voltage variations as great asf

    20 V

    Maximum Ratings, Absolute-Maximum Values:

  • With heater volts =

    125 V

    Maximum Ratings, Absolute-Maximum Values:

  • No.3 connected to cathode at socket, grid-No.2 supply volts =

    2 V

    Maximum Ratings, Absolute-Maximum Values:

  • 125, and cathode resistor (ohms) bypassed =

    56 ohm

    Maximum Ratings, Absolute-Maximum Values:

Characteristic

  • Plate resistance

    280000 ohm

    Promoted published value

  • Transconductance

    8000 uS

    Promoted published value